Model the tungsten filament of a lightbulb as a black body...

Name: Problem 2, Chapter 40: Physics for Scientists and Engineers with Modern Physics
Uploaded: 2020-06-02T15:43:53-08:00
Duration: 1 min 55 s
Channel: Guilherme Barros
Description: Model the tungsten filament of a lightbulb as a black body at temperature 2 900 K. (a) Determine the wavelength of light it emits most strongly. (b) Explain why the answer to part (a) suggests that more energy from the lightbulb goes into infrared radiation than into visible light.

Model the tungsten filament of a lightbulb as a black body at temperature 2 900 K. (a) Determine the wavelength of light it emits most strongly. (b) Explain why the answer to part (a) suggests that more energy from the lightbulb goes into infrared radiation than into visible light.

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Key Concepts

Blackbody Radiation

Blackbody radiation refers to the thermal electromagnetic radiation emitted by an object in equilibrium. The spectrum of this radiation depends solely on the object's temperature. This concept is fundamental in physics because it provides a model for understanding how objects emit energy in the form of photons, distributed over a range of wavelengths as described by Planck’s law.

Wien's Displacement Law

Wien's displacement law states that the wavelength at which the emission of a blackbody spectrum is maximized is inversely proportional to the temperature. This means that as the temperature of an object increases, the peak emission shifts to shorter wavelengths. The law is essential for predicting which part of the electromagnetic spectrum an object at a certain temperature will emit most strongly.

Electromagnetic Spectrum Distribution

The electromagnetic spectrum comprises various ranges of wavelengths, including visible light and infrared radiation. In the context of blackbody radiation, even if the peak emission lies at a wavelength outside the visible range, a significant amount of energy is still radiated across other wavelengths. This explains why an object with a lower temperature might emit more energy in the infrared region than in the visible region.

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